California Institute of Technology Open Course: notes for the first lecture on machine learning and Data Mining

Netfei is a DVD leasing company. by increasing its sales by 10%, it can earn 1 million RMB in revenue, which is very impressive.

How to: predict consumers' ratings for movies? (Increase the predicted value by 10 percentage points through their own systems) if the recommendations you provide to consumers are very accurate, the consumers will be very satisfied.

The essence of machine learning: 1. An existing model: how to evaluate a movie and how others evaluate a movie is also a model;

2. We cannot get a mathematical model. Therefore, we need to use machine learning to solve this problem;

3. Data: a solution is available when data is available.